Behcet’s Disease (BD) is an auto-immune/autoinflammatory complex disease that causes inflammation of the blood vessels. The underlying cause of BD is unknown. The highest prevalence is seen in populations along the ancient silk road, raising the possibility that it may have its origins along these historic trade routes. The genetic makeup that increases BD susceptibility in modern populations might have been advantageous for certain environmental stress factors such as resistance to infections and pathogens. Such an advantage is expected to leave signs of selection on the genes associated with BD. We have observed a possible recent selection on HLA-B as suggested in previous reports, but recent selection signature was not unique to HLA-B, 14 other BD-associated genes also showed recent selection including other MHC loci such as HLA-G, and other genes such as KCKN9 and NOD2 showed even a stronger selection than HLA-B. Results indicate that the BD alleles are not specific to East Asians. They are present in other world populations with appreciable frequencies. This shows that there is no selection favouring specifically these variants in populations with high BD prevalence. In conclusion, a variety of evolutionary processes have shaped the genetic diversity in BD risk genes, and it is difficult to understand the precise mechanisms of selection that underlie these processes. There are some common genes with BD and other inflammatory diseases. Consequently, our findings may not only apply to BD but also to other inflammatory illnesses in general.